As an experienced software developer with a strong background in designing and optimizing code, I am well-equipped to tackle the complex issue you're facing with TradingView's Pine Script. I have worked extensively in Metatrader and Python, two skillsets that align closely with what you're looking for. In fact, I have already dealt with similar problems in the past wherein visibility of certain labels/events was required on multiple platforms.
I understand the importance of maintaining a cohesive trading cycle, which is why I always emphasize on thorough testing before implementation. For your project, this means rigorously monitoring the buy/sell alarms against visual labels over a substantial time period - just as you've suggested. By doing so, we will ascertain the complete elimination of any disappearance issues even on the latest candle. Your WunderTrading bot would consequently be better equipped to manage your trading strategy effectively.
In conclusion, my adaptable skillset, commitment to quality and track record of innovative problem-solving make me an ideal fit for your project. I look forward to collaborating closely with you to ensure not only the resolution of the current issue but also to deliver long-term reliability and effectiveness for all your trading needs on TradingView.